Hello Mr.Alenize

Actually answer to your question is a little complicated. Thus, I offer you read this article.

https://www.researchgate.net/publication/238708994_THE_EFFECT_OF_COMBUSTION_DURATION_ON_THE_PERFORMANCE_AND_EMISSION_CHARACTERISTICS_OF_PROPANE-FUELED_4Stroke_S_I_ENGINES

Regards

Emissions depends on fuel type engine operating conditirons .... etc. What kind of a biofuel you mean ?

Thank you and so much

it depends. generally the use of bio fuels instead of diesel fuel will reduce the delay period (this is good to reduce the tendency to knock) and will increase the combustion duration.

please have a look on the following papers. All the best

thanks and so much

Yes of course it is dependent to the type of fuel and number of Octane.